They don't fit!
I have an Sig P-365 X and mounted a Holosun 507K. The Holosun screws that came with the sight fit perfectly and measure:
11.92 mm overall length.
3.44 mm in diameter
The Gorilla screws measure:
**** #1 9.90mm overall length
2.94mm diameter
**** #2 9.87mm overall length
3.90mm diameter